<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Skip Navigation

13.18: Some Prefixes That Make < cc >

Difficulty Level: At Grade Created by: CK-12
Turn In

1. What always comes before <kle>, a vowel or a consonant? a consonant What always comes before <ckle>, a long vowel, a short vowel, or a consonant? a short vowel What usually comes in front of the <cle>, a vowel or a consonant? a vowel

2. When they are added to stems that start with <c>, the three prefixes ad-, sub, and ob- assimilate to ac-, suc-, and oc-, making a <cc> toward the front of the word. Sometimes the <cc> spells the sound [k]; sometimes it spells [ks].

All of the following words contain one of these prefixes. Analyze each word into prefix and stem to show where the two <c>’s come from:

Word Prefix + Stem
accelerate ad + c + celerate
according ad + c + cord
account ad + c + count
occasionally ob + c + casionally
successful sub + c + cessful
occurrence ob + c + currence
occupy ob + c + cupy
accident ad + c + cident
accurate ad + c + curate
access ad + c + cess
occupation ob + c + cupation
accompany ad + c + company
accommodate ad + c + commodate
succinctly sub + c + cinctly
accuse ad + c + cuse
accumulate ad + c + cumulate

3. Sort the words into these two groups:

Words in which the <cc> spells ...
[k] [ks]
according occupation accelerate
account accompany successful
occasionally accommodate accident
occurrence accuse access
occupy accumulate succinctly

4. Look carefully at the letter that comes right after the <cc> in each of the words. Then sort the words into this matrix:

Words in which the <cc> spells ...
[k] [ks]
Words that have <e> or <i> following the <cc>






Words that do not have <e> or <i> following the <cc>












5. Be ready to discuss this question: Why do the words sort out the way they do in the matrix in Item 4?

Teaching Notes.

Item 2. The assimilation pattern for ad- is introduced in Book 4, Lessons 11-13. That for sub- is introduced in Book 4, Lesson 34, and that for ob- in Book 4, Lesson 37. These patterns are treated in AES as follows: ad-, pp. 188-93; sub-, pp. 183-86; ob-, pp. 195- 96.

Item 5. The discussion should get to the way in which <c> before <e>, <i>, or <y> spells soft <c>, [s], while before other letters it spells hard <c>, [k]. Thus the first <c> in <cc> must be hard since it is followed by a <c>, while the second <c> will be soft or hard, depending on the letter following it.

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Please to create your own Highlights / Notes
Show More

Image Attributions

Show Hide Details
1 , 2 , 3 , 4 , 5
Date Created:
Feb 23, 2012
Last Modified:
Jul 07, 2015
Save or share your relevant files like activites, homework and worksheet.
To add resources, you must be the owner of the section. Click Customize to make your own copy.
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original